$(function(){
    
    //plugin bootstrap minus and plus
    //http://jsfiddle.net/laelitenetwork/puJ6G/
    $('.btn-number').click(function(e){
      e.preventDefault();
      
      fieldName = $(this).attr('data-field');
      type      = $(this).attr('data-type');
      var input = $("input[name='"+fieldName+"']");
      var currentVal = parseInt(input.val());
      if (!isNaN(currentVal)) {
          if(type == 'minus') {
              
              if(currentVal > input.attr('min')) {
                  input.val(currentVal - 1).change();
              } 
              if(parseInt(input.val()) == input.attr('min')) {
                  $(this).attr('disabled', true);
              }
    
          } else if(type == 'plus') {
    
              if(currentVal < input.attr('max')) {
                  input.val(currentVal + 1).change();
              }
              if(parseInt(input.val()) == input.attr('max')) {
                  $(this).attr('disabled', true);
              }
    
          }
      } else {
          input.val(0);
      }
    });
    
    $('.input-number').focusin(function(){
      $(this).data('oldValue', $(this).val());
    });
    
    $('.input-number').change(function() {
      minValue =  parseInt($(this).attr('min'));
      maxValue =  parseInt($(this).attr('max'));
      valueCurrent = parseInt($(this).val());
      
      name = $(this).attr('name');
      if(valueCurrent >= minValue) {
          $(".btn-number[data-type='minus'][data-field='"+name+"']").removeAttr('disabled')
      } else {
          alert('Sorry, the minimum value was reached');
          $(this).val($(this).data('oldValue'));
      }
      if(valueCurrent <= maxValue) {
          $(".btn-number[data-type='plus'][data-field='"+name+"']").removeAttr('disabled')
      } else {
          alert('Sorry, the maximum value was reached');
          $(this).val($(this).data('oldValue'));
      }
    });

    $(".input-number").keydown(function (e) {
      // Allow: backspace, delete, tab, escape, enter and .
      if ($.inArray(e.keyCode, [46, 8, 9, 27, 13, 190]) !== -1 ||
           // Allow: Ctrl+A
          (e.keyCode == 65 && e.ctrlKey === true) || 
           // Allow: home, end, left, right
          (e.keyCode >= 35 && e.keyCode <= 39)) {
               // let it happen, don't do anything
               return;
      }
      // Ensure that it is a number and stop the keypress
      if ((e.shiftKey || (e.keyCode < 48 || e.keyCode > 57)) && (e.keyCode < 96 || e.keyCode > 105)) {
          e.preventDefault();
      }
    });

});